Issue with 2FA in TrueNAS Core 12 Beta2

On Sat 22nd Aug 2020, I set up 2FA (Systems > 2FA) on my TrueNAS Core 12 Beta2 server.

The following are the rough guideline of steps taken:

1. Left everything as it is stated in 2FA (possibly chnaged the timer interval of code change to 25 secs)
2. Clicked on Enable 2FA
3. Clicked on Show QR Code

I used Google Authenticator app from my mobile to scan the QR Code.
Google Authenticator accepted the QR code and my mobile was set up with generating the codes.

I then clicked on Save in 2FA.

I logged out as I thought, there was nothing else to do and now when I try to login, I keep get the following:
 

I'm now unable to login.

Guys from the iXSystems community forums mentioned to reset my root password, via console method which I did.

To no avail I still get the same result as shown in the screenshot